First slide

Pleiotropy

Question

Phenotypic expression of phenylketonuria includes
A. Mental retardation
B. Reduction in hair
C. Reduction in skin pigmentation.

Easy

A

A and B
B

A and C
C

A, B and C
D

B and C

Solution

Phenylketonuria is an example for pleiotropy. A single gene influences more than one phenotypes is known as pleiotropy. Phenotypic expression of this disease includes mental retardation, reduction in hair and skin pigmentation.

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